| 摘要 |
1293387 Chucks MOLINS MACHINE CO Ltd 14 May 1970 [14 May 1969] 24632/69 Heading B3B [Also in Division F2] An actuator assembly for a machine tool comprises an hydraulically actuated chuck 1 carried by a spindle 2 which is rotatably mounted in at least one hydrostatic bearing 3, the bearing having a plurality of recesses 8 circumferentially spaced around the spindle and contained in a plane perpendicular to the axis of the spindle, an axial passage 16 in the spindle extending to at least two radial passages 14, 15 which are in the plane of the recesses and communicate with the outer surface of the spindle, each radial passage having a flow restrictor therein and being angularly spaced from each other such that at any time at least one of them is in communication with a recess, whereby upon rotation of the spindle pressurized fluid is supplied by each recess in turn through the radial and axial passages to actuate the chuck. A second hydrostatic bearing 4 may be provided adjacent the bearing 3 and/or at the other end of the spindle and separate sets of passages may be provided in the bearings 3 and 4 for pressure and return lines to the chuck. |
